I've searched around, but can't figure out what to call it. My coworker needs me to figure out if this is possible.

She's looking for a kind of crosshair/guideline thing for the cell that you're on. So say you're on cell N12, it's got a nice dark line that goes all the way back to the column 1 and all the way up to row A. It makes it easier to view everything else in that particular row and column.